Thanks again for all the replies.
We have good news
We had a committee meeting yesterday and unanimously agreed that
it was not acceptable for this man to walk up and down other plot holders'
paths. I said I would email the Council's allotment department first, just
to make sure that they would support us if we needed it.
I received a reply almost immediately, saying that the path is part of the plot and
only the plot holder and the Site Secretary have access.
Where the path divides two plots, each tenant has shared access, and each has
responsibility for maintaining half.
These are not communal areas and access to anyone else is precluded. (Rule 8.1)
Therefore, this person should not be taking his dog or himself across the paths.
I have written this man a polite letter on our headed notepaper and two other
committee members have offered to give it to him.
I'll let you know what happens, thanks again for all your interest and advice.